Waske, Anja ; Giebeler, Lars ; Weise, Bruno ; Funk, Alexander ; Hinterstein, Manuel ; Herklotz, Markus ; Skokov, Konstantin ; Fähler, Sebastian ; Gutfleisch, Oliver ; Eckert, Jürgen (2015)
Asymmetric first-order transition and interlocked particle state in magnetocaloric La(Fe,Si)13.
In: physica status solidi (RRL) - Rapid Research Letters
doi: 10.1002/pssr.201409484
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In-situ synchrotron XRD measurements of the magnetocaloric material LaFe11.8Si1.2 are used to understand virgin effects and asymmetry of the underlying first order magnetovolume transition. A remarkable change of the transition kinetics occurs after the first cycle, which we attribute to the formation of cracks originating from the volume change. Tomographic imaging revealed that the bulk material disintegrates via an interlocked state where fragments are loosely connected. Though cracks have opened between the fragments, the transition is sharp, which we attribute to magnetostatic interactions. In the cycled sample we find a strong asymmetry between the transition interval upon heating and cooling, which we explain by isostatic pressure acting on parts of the sample during the cooling transition.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Waske, Anja ; Giebeler, Lars ; Weise, Bruno ; Funk, Alexander ; Hinterstein, Manuel ; Herklotz, Markus ; Skokov, Konstantin ; Fähler, Sebastian ; Gutfleisch, Oliver ; Eckert, Jürgen |
| Art des Eintrags: | Bibliographie |
| Titel: | Asymmetric first-order transition and interlocked particle state in magnetocaloric La(Fe,Si)13 |
| Sprache: | Englisch |
| Publikationsjahr: | 2015 |
| Verlag: | WILEY-VCH Verlag GmbH & Co. KGaA |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | physica status solidi (RRL) - Rapid Research Letters |
| DOI: | 10.1002/pssr.201409484 |
| Kurzbeschreibung (Abstract): | In-situ synchrotron XRD measurements of the magnetocaloric material LaFe11.8Si1.2 are used to understand virgin effects and asymmetry of the underlying first order magnetovolume transition. A remarkable change of the transition kinetics occurs after the first cycle, which we attribute to the formation of cracks originating from the volume change. Tomographic imaging revealed that the bulk material disintegrates via an interlocked state where fragments are loosely connected. Though cracks have opened between the fragments, the transition is sharp, which we attribute to magnetostatic interactions. In the cycled sample we find a strong asymmetry between the transition interval upon heating and cooling, which we explain by isostatic pressure acting on parts of the sample during the cooling transition. |
| Freie Schlagworte: | magnetic refrigeration, magnetocaloric materials, phase transitions, La(Fe,Si)13, X-ray diffraction |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 10 Feb 2015 09:49 |
| Letzte Änderung: | 10 Feb 2015 09:49 |
| PPN: | |
| Sponsoren: | A. Waske, B. Weise, S. Fähler and O. Gutfleisch gratefully acknowledge funding by DFG (SPP 1599, www.Ferroic-Cooling.de, WA 3294/1-1, FA 453/11-1, GU 514/3-1)., K. P. Skokov is grateful to the European Community’s 7th Framework Program under the grant agreement No. 310748 (DRREAM). |
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